@article{CMUC_1993__34_3_a7,
     author = {Kowalski, Old\v{r}ich},
     title = {Nonhomogeneous {Riemannian} 3-manifolds with distinct constant {Ricci} eigenvalues},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {451--457},
     publisher = {mathdoc},
     volume = {34},
     number = {3},
     year = {1993},
     mrnumber = {1243077},
     zbl = {0789.53024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1993__34_3_a7/}
}